Four transit cops who are part of an NYPD surge in the city’s subway system nabbed an accused killer when he jumped a turnstile Monday — then turned around hours later and collared a suspected serial slasher.

The plainclothes cops — Officers William Haut, Jazmin Roman and Bonlei Wong and their sergeant, Clyde Jasmin — spotted Claude White, a homeless man who allegedly stabbed a straphanger to death Saturday, hopping over the turnstile at the Lexington Avenue station at 125nd Street on Monday morning.

The eagle-eyed cops recognized him from a department wanted poster and had him in cuffs by 10:40 a.m., NYPD brass said during a press conference.

Less than 24 hours later, the same team of cops were on an East Harlem street when they spotted Kemal Rideout, a 28-year-old man who allegedly slashed three random women in Manhattan over the weekend.

When he was arrested, Rideout was standing on the corner of East 122nd Street and Second Avenue eating a bag of chips he bought from a bodega after being chucked from an MTA bus for evading the fare, cops said.

The four officers recognized him from an internal wanted poster, also — and by 9:40 a.m. Tuesday, he was in custody, too.

“Simply put: Phenomenal. Great police work,” Chief Michael Kemper said during a Tuesday press conference. “I cannot understate how proud and impressed I am by the officers present with us today.”

Police Commissioner Keechant Sewell also commended the four cops in a Tuesday afternoon Twitter post.

“Today, as they do every day, these @NYPDTransit officers took to the rails to keep NY’s straphangers safe,” she wrote. “It didn’t take them long to spot the suspect wanted for several stabbings this weekend — he’s now in police custody.

“Thank you to these officers and every member of the NYPD for what they do every day!” she continued.

White, a 33-year-old homeless man, has since been charged with murder for allegedly killing Bronx resident Tavon Silver, who cops say he attacked after the two argued on a southbound No. 4 train as it pulled into the 14th Street/Union Square station in Manhattan around 4 a.m. Saturday.

Meanwhile, Rideout was charged with three counts of felony assault for slicing the three women — one of whom was cut so badly she needed a tourniquet to stem the bleeding before she was taken to Bellevue Hospital.

Both of the suspects had a litany of priors: White had been previously locked up six times, including in a June arrest for allegedly trying to rob a Manhattan bank by passing a note to the teller demanding money, law-enforcement sources have said.

Rideout’s rap sheet includes past charges of attempted rape, assault and criminal mischief, according to police. He has a history of mental illness, sources said.

Kemper, the department’s chief of transit, used the arrests to highlight the NYPD’s increased presence in the city underground — which he said has resulted in a 52% rise in arrests, 57% increase in tab summonses, 64% boost in quality-of-life tickets and 143% increase in fare evasion summonses so far this year compared to the same period in 2022.

“Due to these incidents … a decision was made to infuse more cops into the subway,” Kemper said. “That started over the weekend and continues today. … There are no immediate plans to reduce that.”

“The goal was to stabilize crime and stop the increase,” Kemper said. “And we said we wanted to be able to sustain that, and we did.”